I haven’t started to work yet, but I value these truths.
Have professional relationships. Treat people well but don’t expect too much from them since you are not best friends. Separate private life and professional one, be careful about office love affairs.
Become irreplaceable, for your company and yourself.
Do real work, but also make yourself visible so opportunity can come to you.
People don’t like criticism, try to be sympathetic, not honest idiot.